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While small-block Chevys are renowned for their interchangeability, Bow Tie engineers tossed us a curve in 1987, when they changed the bolt angle of the four center bolts on the intake flange. That demanded a matching change to the intake bolthole angles. Some aftermarket manifold companies responded by slotting the boltholes and adding this adapter, which makes it possible to use a standard small-block intake on ’87-and-later heads. Vortec heads use a completely different intake-port and bolt-spacing arrangement.